A filter command that postfixes lines by the number of occurrences. Differently from sort | uniq -c, you don't need to sort input lines.

Currently, this command is just the following gawk script.

{a[$0]++}END{for(k in a)print k,a[k]}

$ echo a b c a b c a | xargs -n 1 | awk '{a[$0]++}END{for(k in a)print k,a[k]}'
a 3
b 2
c 2
$ echo a b c a b c a | xargs -n 1 | ct
a 3
b 2
c 2

$ ls /usr/local/bin/ct
(Please check that no command with the same name exists.)
$ cp ct /usr/local/bin/

This command will be implemented with Rust.

This command is distributed under GPL-3.0 or later. But it will be done under GPL or MIT dual license.